I need help with this amplifier...

[bogdan_borko]

1. Set the vas stage current to to 20mA and if you use only one pair of otput mosfets, remove R21 and R22, they`re useless.

2. There is a mistake in your circuit! :
Q7 and Q8 should be PNP
Q5 and Q6 should be NPN !!!
OTHERWISE IT WILL NOT WORK...

3. You can raise the VAS current by increasing R5 and R6 value or decreasing R12,R14 and R15 value.

I think you`ve made enough of Bora amplifiers...

PoZdrav!

 

[viktor1986]

!

Yes,I know bogdan that I have mistake in schematic!It's my fault.

I tested this schematic with power supply +/-46V DC.Current of VAS+LTP is 20mA with values like on the picture.Sound is pretty OK for now.

 

[kASD]

Hey VIKTOR 1986,

Is that you in your avataar!

K a n w a r

 

[viktor1986]

!

Hey VIKTOR 1986,

Is that you in your avataar!

K a n w a r

Yes!Why?!

 

[kASD]

VIKTOR I asked just out of curiosity! you just looked like TOM CRUISE in his Teenages....

 

[viktor1986]

!

VIKTOR I asked just out of curiosity! you just looked like TOM CRUISE in his Teenages....

He he he!

 

[anatech]

Hi Kanwar,
If you look closely, you will see that Viktor has two eyebrows, not one.


-Chris

 

[viktor1986]

!

I will built Techno amplifier with one pair of IRFP and power supply +/-42V DC.

 

[anatech]

Hi viktor1986,
You might want to use two pair at least. Just to distribute the heat a bit. You need to account for phase angles when calculating current in your loads.

-Chris